Oilon Geopro RE, Operation Manual

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RE010070948EN 7/23
2.3. Coefficient of perfomance
Heat pump efficiency ratio is measured with coefficient of performance, COP. COP indicates the
amount of heat energy transferred into compressor in relation to used electrical energy.
COP depends largely on heat source and heating network temperatures. The highest possible
heat source temperature and the lowest possible supply water temperature improve efficiency
ratio.
When using heat pump, floor heating is more reasonable option than radiator heating because floor
heating requires lower supply water temperature.
2.4. Sizing heat pump
Heat pump can be sized up to operate at partial or full capacity. With partial capacity heat pump
maximum capacity is sized up to correspond 60…80 % of building maximum heating demand.
Then heat pump produces 85…98 % of buildings annual heat energy demand. With partial
capacity heat pump operates for long time periods which reduces compressor stops and start-
ups. This decreases compressor wearing. During hardest cold periods at winter additional
capacity can be obtained from secondary heating source, for example from buffer tank in-built
electric heater or oil boiler.
With full capacity, heat pump is sized up according to buildings maximum capacity demand, and
is practically little over sized.